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DC Generators

DC Generators
A triplex wave winding will have parallel paths.

None of the listed here
4
2
6

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DC Generators
As a result of armature reaction, the reduction in the total mutual air gap flux in a D.C. generator is approximately

40 percent
25 percent
5 percent
10 percent

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DC Generators
In D.C. generators on no-load, the air gap flux distribution in space is

Pulsating
Flat topped
Triangular
Sinusoidal

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DC Generators
Permeance is the reciprocal of

Ampere turns
Resistance
Flux density
Reluctance

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DC Generators
The number of brushes in a commutator depends on

Type of winding
Amount of current to be collected
Voltage
Speed of armature

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DC Generators
To avoid formation of grooves in the commutator of a D.C. machine

The brushes of opposite polarity should track each other
The brushes of same polarity should track each other
Brush position has no effect on the commutator grooving
All of these

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